IGFC system and method for conveying pulverized coal through high-temperature fuel cell anode tail gas

Abstract

The invention discloses an IGFC system and a method for conveying pulverized coal through high-temperature fuel cell anode tail gas, wherein raw coal is ground and dried in a coal preparation unit to form dry coal powder, high-pressure tail gas generated by a high-temperature fuel cell anode is conveyed to a gasification furnace, oxygen generated by a deep cooling air separation unit is conveyed to the gasification furnace for reaction, furnace slag is generated at the bottom of the gasification furnace, high-temperature raw gas generated at the top is fed into a waste heat boiler, the raw gas with waste heat recovered by the waste heat boiler is enabled to enter a hot side inlet of a first gas-gas heater, and gas at a cold side outlet of the first gas-gas heater is taken as fuel gas and is enabled to enter the high-temperature fuel cell anode for reaction; tail gas at an outlet of the high-temperature fuel cell anode is fed into a catalytic combustor for combustion reaction, after high-temperature and high-pressure gas is generated, the gas turbine does work and is fed into a waste heat boiler, and the combustion tail gas is cooled and then discharged into the atmosphere. The cold coal gas efficiency of the gasification furnace is improved, the requirement for preparing high-purity nitrogen is omitted, and the air separation energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of coal power generation, and relates to an IGFC system and method for transporting pulverized coal by using high-temperature fuel cell anode tail gas. Background technique [0002] The coal gasification device in the IGFC system converts solid coal into clean gaseous gas, which provides conditions for the indirect use of coal by high-temperature fuel cells. There are usually two ways to feed coal into the gasification device. The first is to use pneumatic conveying to send dry coal powder into the gasification device, and the other is to use a coal slurry pump to send wet coal to the gasification device. The coal water slurry is sent to the gasification unit. The IGFC system configured with dry feed gasification has higher net power generation efficiency, but it needs to use inert gas as the medium for pneumatic transportation. At present, most gasification devices use high-purity nitrogen produced by cryogenic air...

AI Technical Summary

Problems solved by technology

However, the production of high-purity nitrogen by the cryogenic air separation system requires more energy, and the temperature of the high-purity nitrogen is low, and the temperature needs to be raised synchronously in the gasification device, which consumes fuel chemical energy, which is not conducive to improving the cooling of the gasifier. gas efficiency

Images